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Raju : All the known elements at the tim...

Raju : All the known elements at the time of Dobereiner. could not be arranged in the form of triads. Divya : Mendeleeff tried to explain the similarities of elements in the same group in terms of their electron configuration.

A

Both Raju and Divya are correct

B

Raju is correct but Divya is wrong

C

Raju is wrong but Divya is correct

D

Both are wrong

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Mendeleeff tried to explain similarities of elements in the same group by using their _____________

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The elements of the following group lose 3 electrons to form tri-positive ions:

Numerous forms of the periodic table have been devised from time to time. A modern version which is most convenient and widely used is the long or extended from of periodic table. The aufbau principle and the electronic configuration of atoms provide a theoretical foundation for the periodic classification. The horizontal rows are called periods. There are altogether seven periods. The first period consists of 2 elements. The subsequent periods consists of 8, 8,18, 18 and 32 elements respectively. The seventh period is incomplete and like the sixth period would have maximum of 32 elements. Elements having similar outer electronic configurations in their atoms are grouped in vertical columns. These are referred to as groups or families. According to the recommendations of IUPAC, the groups are numbered 1 to 18 replacing the older notation of groups 0, IA, IIA, ....VIIA, VIII, IB.....VIIB. Each successive period in the periodic table is associated with the filling up next higher principal energy level following aufbau sequence. The number of elements in each period is twice the number of atomic orbitals available in the energy level that is being filled. All the elements are classified into four blocks, i.e., s-block, p-block, d-block, and f-block depending on the type of atomic orbitals that are being filled with electrons. What is the position of the element in the periodic table satisfying the electronic configuration (n-1)d^1 ns^2 for n=4 ?

Without knowning the electronic configurations of the above of the atoms of elements Mendeleeff still Could arrange the elements nearly close to the arrangements in the modern periodic table . How can you appreciate this ?

Newlands proposed the law of octaves . Mendeleeff suggested eight groups for elements in his table . How do you explain these observations in terms of modern periodic classification ?

In the modern periodic table, the elements are placed in order to increasing atomic number. These have been numerous designs of the table over the years but the most common is the long form of periodic table. The long form of periodic table shows all the elements in numerical order. Write the expected ground state electronic configuration of the element with one unpaired 5p electron that forms a covalent compound with fluorine.

Nitrogen forms a simple diatomic molecule but other elements of same group do not form. Explain.

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VGS PUBLICATION-BRILLIANT-CLASSIFICATION OF ELEMENTS-THE PERIODIC TABLES-EXERCISE
  1. 11, 12, 13 and 14 are the atomic numbers of the elements Na, Mg, Al an...

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  2. The most electronegative element is

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  3. Raju : All the known elements at the time of Dobereiner. could not be ...

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  4. (i) Newlands proposed the law of octaves. ii) The law of octaves was ...

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  5. State and give one example for Dobereiner's law of triads and Newland'...

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  6. "Select the common point/s' in Dobereiner and Newlands Laws. i) Atomic...

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  7. Assertion (A) : Mendeleeff placed "Be, Mg and Ca" in one group. Reaso...

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  8. Which one is not a salient features of the Mendeleeff's periodic table...

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  9. A: The properties of elements are the periodic functions of their atom...

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  10. Assertion (A) : It is a better way of arranging the elements in the pe...

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  11. Z indicates in the notation ^A.Xz. i) Number of protons in the atom ii...

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  12. Assertion (A): Na' is a s-block element Reason (R) : 'Na' gets its las...

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  13. Assertion (A) : 'Cl' is a non-metal. Reason (R): Non-metal has five or...

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  14. (a) Lanthanoids and actinoids are belongs to 3rd group. b) Lanthanoids...

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  15. Assertion (A) : Lanthanides and Actinides are called as Inner  Transit...

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  16. Why do elements in the same group have similar physical and chemical p...

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  17. The pair of elements that have similar chemical properties are

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  18. Pavan (P) : The general electronic configuration of alkali metal famil...

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  19. Assertion (A): ‘H' & 'He' belongs to period - 1. Reason (R) : 'H & 'He...

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  20. Assertion (A): The first period in periodic table contain only two ele...

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